Isn't anyone gonna talk good about byron's? I started out using top fuel, and switched to byron's 20%.. When i asked the people at the LBS, they told me that byrons was the best on the market. And i have heard that from several different people. I think it makes my truck run like a raped ape. I can deffinatly tell a difference in shifting too. Seems like it shifts alot smoother, and alot faster than what it used to. I would highly recommend giving it a shot.